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Morrison, H.A., Dionne, H., Rusten, T.E., Brech, A., Fisher, W.W., Pfeiffer, B.D., Celniker, S.E., Stenmark, H., Bilder, D. (2008). Regulation of early endosomal entry by the Drosophila tumor suppressors Rabenosyn and Vps45.  Mol. Biol. Cell 19(10): 4167--4176.
FlyBase ID
FBrf0207002
Publication Type
Research paper
Abstract

The small GTPase Rab5 has emerged as an important regulator of animal development, and it is essential for endocytic trafficking. However, the mechanisms that link Rab5 activation to cargo entry into early endosomes remain unclear. We show here that Drosophila Rabenosyn (Rbsn) is a Rab5 effector that bridges an interaction between Rab5 and the Sec1/Munc18-family protein Vps45, and we further identify the syntaxin Avalanche (Avl) as a target for Vps45 activity. Rbsn and Vps45, like Avl and Rab5, are specifically localized to early endosomes and are required for endocytosis. Ultrastructural analysis of rbsn, Vps45, avl, and Rab5 null mutant cells, which show identical defects, demonstrates that all four proteins are required for vesicle fusion to form early endosomes. These defects lead to loss of epithelial polarity in mutant tissues, which overproliferate to form neoplastic tumors. This work represents the first characterization of a Rab5 effector as a tumor suppressor, and it provides in vivo evidence for a Rbsn-Vps45 complex on early endosomes that links Rab5 to the SNARE fusion machinery.

PubMed ID
PubMed Central ID
PMC2555928 (PMC) (EuropePMC)
Related Publication(s)
Personal communication to FlyBase

Vps45 and MENE(3R)-C.
Bilder, 2009.6.3, Vps45 and MENE(3R)-C. [FBrf0208087]

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Secondary IDs
    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Mol. Biol. Cell
    Title
    Molecular Biology of the Cell
    Publication Year
    1992-
    ISBN/ISSN
    1059-1524
    Data From Reference
    Aberrations (3)
    Alleles (9)
    Genes (17)
    Human Disease Models (1)
    Physical Interactions (5)
    Cell Lines (1)
    Natural transposons (1)
    Insertions (1)
    Experimental Tools (1)
    Transgenic Constructs (2)